AssertJ 3.13.0 requires OpenTest4J (java.lang.NoClassDefFoundError: org/opentest4j/MultipleFailuresError)

[PascalSchumacher]

If the classpath does not contain OpenTest4J (e.g. you use JUnit 4 instead of JUnit 5) AssertJ 3.13.0 fails with:

java.lang.NoClassDefFoundError: org/opentest4j/MultipleFailuresError

A sample project to reproduce this issue: https://github.com/PascalSchumacher/assertj-3.13.0-requires-junit5-bug

[PascalSchumacher]

The hard dependency on OpenTest4J was introduced with this commit: d79423d#diff-4df7ee848542cb94166b422c1c3b05bd

[joel-costigliola]

my bad :(
this is not too serious IMO as people usually have opentest4j in their dependencies but let's try to fix that (if that's possible)

[joel-costigliola]

AssertJ Core 3.13.1 is released with this fix.